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ADS1298ECG-FE shield

Oscar Baumann
Intellectual 835 points
Other Parts Discussed in Thread: ADS1298

I have one question ECG_SHD_DRV on ads1298ecgfe is not connected on board,

I want to know what is the difference between connect  or not connect that part of the circuit?

If you have an image so i can see the difference.

I known that shield cables connection is to eliminate noise from ecg cables.

But why is not connected?

thanks

  • 0
    TI__Mastermind 43915 points

    Hi Oscar,

    The shield driver is designed to run on top of the RLD signal 180 degrees out of phase to help shield the RLD signal across longer distances. All of our design and testing with the ADS1298 has been across short distances using a patient simulator. Shield drivers are generally used in ECG systems with cables that are of longer distances (2+ meters). During assembly of the board, we left the shield driver circuit unpopulated as the demonstration kit was not designed to be used with a real patient.

    Regards,

    Tony

  • 0 in reply to Tony Calabria
    Prodigy 60 points

    Hi dear TI-staff,

    I am evaluating the PDK with normal electrode-cables. They are 3 meters long... I have to show the overall quality of the measurement, compared with ADInstruments-hardware. ( It is a work for my university, something like a master thesis)

    Do you mean, the shield-driver is not built on board, does that result in unshielded cables? Can I build something to get a shield for the cables?

    I am using:     Cables from "Biometric cables" (the ones in the datasheed)

                             ADS1298 ECG-FE (Rev C)

    Maybe you can also help me with another problem: I want to connect a generator (sinus) to channel 2, but to get better results i want to connect also the right leg. How should I do that ? Connecting to earth still gets me 50 Hz noise (about 0.3 mVpp, sinus = 1 mVpp) I am using a bipolar generator.

    thank you very very much!

    have a nice day,

    sincerely yours, Philip